Data-sharing-and-protection.zip_Protection

#include <iostream> using namespace std; class Cat { public: Cat(int age):itsAge(age){ HowManyCats++ ;} ~Cat(){ HowManyCats-- ;} int GetAge(){return itsAge;} void SetAge(int age){itsAge=age;} static int GetHowMany(){return HowManyCats;} private: int itsAge; static int HowManyCats; }; int Cat::HowManyCats=0 ;//初始化HowManyCats，值为0 void TelepathicFunction(); int main() { Cat CatHouse1(1); TelepathicFunction(); Cat CatHouse2(2); TelepathicFunction(); return 0; } void TelepathicFunction() { cout<<"There are "<< Cat:: GetHowMany() <<"cats alive!\n";//调用GetHoMany() }